Profile personalisation: Coding questions

My name is Wave_Rida and I was working on my profile. getting along fine, until I tried to enlarge some words on there. Tried both known codings ( the <~h3> and the <~big> codes ( without the ~ sign)) but both dont seem to work. Anyone have a clue/tip? Or is it just because I hit a maximum amount of letters? Thanks alot in any case.

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